Abstract
The structural design methodology for buried pipelines for conventional (trenched) applications is well documented in existing published standards. Such information is however very limited for trenchless installations. It is common practice to use these conventional trench installation design methods for trenchless installations both for new pipelines (pipe jacking, microtunnelling and horizontal directional drilling) and pipeline rehabilitation. This approach often results in conservative outcomes. This paper identifies what information is available in existing Australian and New Zealand standards, overseas standards and other publications and provides design guidelines for the structural design of both rigid and flexible pipelines installed using trenchless installation methods.
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